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radio waves below 22 khz this website and its internal pages do not incorporate profiling cookies but only technical ones used to allow the correct counter working bravenet and shinystat not other ik1qfk renato romero home page exploring ulf elf and vlf radio band www vlf it web site services radio nature reception and study of natural origin radio signals by renato romero english version is available by rsgb www rsgbshop org visitors access since 01 09 1999 click on the counter to view visitors data p rovided by http www bravenet com promoted sites and activities vlf projects aligned to open lab rule lw rdf project by manfred kerckhoff they are constantly updated recommendation itu r v 431 9 10 2025 nomenclature of the frequency and wavelengh bands used in telecommunications pdf 335 kb most recently published downconversion of vlf signals to the audio band for practical measurement by j m polard p newton posted may 26 minivin acqboard by a vinassa posted apr 26 an optical active isolator for vlf receiver by a vinassa posted jan 2025 diy ground loop breaker for clear vlf reception by a vinassa posted sep 2024 a simple pps pulse shortener by j m polard m vallejo posted jan 2024 vlf experiences azimuth localization of sferics tweeks and visualization on polar map by v cammelli posted aug 2021 reception of time and frequency reference signals in lviv ukraine by ihor storozh posted mar 2020 albania earthquake in nov 26 2019 by r romero posted dec 2019 tweeks sferics distance calculation by v cammelli posted nov 2018 on the potential meteors elf vlf radiations perseids 2009 campaign by j l rault posted on nov 09 saq commemorative transmissions by claudio parmigiani iz2fer posted jan 08 luminous phenomena in the hessdalen valley and vlf emissions by r romero and j monari upd nov 2005 earthquake precursors by dionysios dimakos upd apr2004 the remote control frequencies by jean marie polard upd nov 2003 vlf at home by c parmigiani upd oct 2002 reception of strange vlf signals with a pc by harald lutz upd nov 2001 seismic radio emissions by r romero upd dec 2001 when signals don t arrive from too far away see the false receptions by r romero upd 25 08 00 vlf monitoring of 18 11 99 leonid meteors by r romero upd 19 01 00 o pe ra permanent observatory on natural radio emissions by r romero upd 19 01 00 last inspire mission of mir nasa inspire project by r romero upd 05 12 99 active and passive systems by r romero upd 26 07 99 unattended operations when the station work automatically by r romero upd 22 10 99 theory and itu licences design of high performance magnetic field sensors for elf lf signal reception and characterization by evan iverson posted nov 2012 synergistic living with the geomagnetic field by john meloy posted jun 2012 simple earth ionosphere waveguide calculation by thierry alves upd oct 2003 on the possible origin propagation and detectability of electromagnetic precursors of earthquakes by e r mognaschi upd apr 2003 what and where is the natural noise floor by john meloy upd jan 2003 fft for dummies by r romero upd oct 2002 receiving loop theory by william e payne upd oct 2002 elf and vlf frequency guide by jacobsen upd nov 2001 experiments on radio direction finding with an ortholoop by vittorio de tomasi upd jul 2001 multidimensional em field analysis and representation by peter schmalkoke upd jun 2001 thinking about ideal loops by m bruno upd feb 2001 the russian vlf time signal stations beta by t jacobsen upd 04 12 00 the russian vlf navaid system alpha rsdn 20 by t jacobsen upd 20 07 00 stations itu lic and services below 22 khz by r warnett others upd 24 02 00 radio signals of natural origin theory by r romero upd 31 12 99 reception techniques a simple and accurate audio marker generator by a vinassa and r romero posted oct 2023 recycling an old smartphone by m recchia posted jun 2019 dcf77 or msf time delay j m polard p newton posted feb 2019 creative sound blaster x fi modification by m pernter posted apr 2018 from coaxial to optical fiber by p poggi posted dec 2014 the stealth antenna by p poggi posted oct 2014 dual polarization balanced vlf antenna by p poggi posted may 2014 a high bandwidth low noise optical vlf link by mike smith posted feb 2014 idealloop h301 vlf loop receiver by l feletti and r romero posted jan 2014 audio antenna by pierluigi poggi posted jul 2013 new theory about the elf ground signals by kurt diedrich posted jun 2013 installation of tnu vlf receiver by le minh tan and tnu vlf group tay nguyen university posted feb 2013 measuring around 50 hz by luca feletti posted jun 2012 a very simple vlf pocket receiver by wilfried fritz posted apr 2012 induction coil ics101 by r romero posted nov 2011 a 0 1 to 40 hz sensing conditioning and recording system part 1 3 the loop and the pre amplifier part 2 3 the signal conditioner part 3 3 the recorder by serge lacôte posted jan 2012 explorer e202 vlf portable receiver by renato romero posted dec 2010 the b3cks vlf antenna project by torsten heer posted sept 10 upgrading recording methods by dave ewer posted on apr 08 notes on dimensioning a minimal electrical field receiver for elf ulf bands by andrea dell immagine iw5bhy posted jan 08 characterization and use of a minimal loop in rdf automatic monitoring stations by renato romero nov 07 in search of the schumann resonances by c re jul 06 spectrum 1 vlf receiver by d ewer jul 06 ada an active differential antenna for 5hz 500 khz by claudio re upd nov 2005 a minimal elf loop receiver by r romero upd sept 2005 characteristic of unexplained ground elf signals by k diedrich f p zantis upd jun 2005 floating solar receiver by renato romero upd jun 2004 how does an earth dipole work by renato romero upd mar2004 rdf earth monitoring by renato romero upd dic 2003 vlf tube receiver by giuseppe accardo and alan scremin upd aug 2003 the lock in modulation in ultra low frequency application by a ghedi upd may 2003 noise suppression on a pc by tomislav stimac and berislav bracun upd jan 2003 xsp x signal prædactor receiver front end by g seleri upd aug 2002 vlf antenna bikeloop by r c parmigiani g seleri upd may 2002 storm monitor by russell e clift ab7if upd oct 2001 magnetic antennae for ulf by hans michlmayr upd jun 2001 rdf software with a fixed loop by r romero upd may 2001 going low in frequency with loop antennas by p schmalkoke upd may 2001 an easy vlf loop 200hz 20khz reception without transformers by r romero m bruno upd dic 2000 mobile stereo natural radio 2 another approach to natural radio by d ewer upd 18 06 00 mobile stereo natural radio part 1 by d ewer upd 07 05 00 the use of low noise op amp by m bruno upd 24 02 00 vlf openlab observatories live data vlf monitoring station cmn cumiana it electric by r romero ero etna volcano it by e r o team virgo it by e g o team sos enattos mine it by e g o team landes f by j m brieussel m brunel monitoring network overview no longer active or on standby rmg romagna it by f scremin ira northern cross radio telescope it by ciph icph ira inaf lrn laurentian univ ca by k saroka cmn cumiana it magnetic by r romero pnt pontese dew it by csp how to start up a vlf observatory by r romero how to put a vlf observatory on line by r romero create your own streaming vlf audio program by r romero opera 2015 radio seismic emission permanent observatory by r romero ended in august 2016 signals gallery elf pulsations gallery srs reception by f francione posted oct 2014 elf ground signals gallery by kurt diedrich posted jul 2013 wistlers gallery by dave ewer posted jun 10 risers and chorus gallery by dave ewer posted jun 10 chorus gallery by d ewer posted jun 10 rdf earth dipole reception gallery by renato romero upd jan 2004 unexplained ulf elf signals gallery n 3 by r romero upd 09 10 00 unexplained ulf elf signals gallery n 2 by r romero upd 07 05 00 free topic collaborations store n 1 various upd 28 03 00 wide band listening 2hz 22khz nature radio by r romero upd 26 07 99 unexplained ulf elf signals gallery n 1 by r romero upd 26 07 99 ulf elf experiences underground reception of sch resonances by sven nordin posted se pt 2013 the schumann s symphonies by pierluigi poggi posted jul 2013 signals in the elf range part iii 1 by k diedrich f p zantis posted jun 10 signals in the elf range part iii 2 by k diedrich f p zantis posted jun 10 large induction coil for ulf monitoring by m bruna oct 06 unknown elf signals and ground currents by kurt diedrich upd oct 2003 frozen lightnings by c parmigiani upd aug 2002 zevs the russian 82 hz elf transmitter by t jacobsen upd gen 2001 reception of submarine communication systems by r romero v lehtoranta upd 22 11 99 all the material of this web site can be reproduced only for not commercial use indicating the source except where a copyright owner is indicated
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